* {
    margin: 0;
    padding: 0;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.D_main {
    width: 100%;
    height: 100%;
    padding: 20px 40px;
}

.mb {
    margin-bottom: 30px;
}

.mb span {
    margin-right: 40px;
}

.mb [type="text"] {
    border: none;
    outline: none;
    border-bottom: 1px solid #ccc;
    width: 200px;
}

table {
    width: 90%;
    border: 1px solid #000;
    border-collapse: collapse;
}

table thead tr {
    font-weight: bold;
}

table tr td {
    text-align: center;
    border: 1px solid #000;
}

.btn {
    width: 300px;
    height: 30px;
    left: 40%;
    position: absolute;
    bottom: 20%;
}

.btn button {
    width: 100px;
    height: 30px;
    background: #fff;
    border: 1px solid #ccc;
    border-radius: 5px;
    outline: none;
    margin: 0 10px;
}